Have you ever looked at the sky in the night? Have you been you in your terrace gazing the sky in the nigh? Everyone would like to enjoy the scene of the bright stars. Normally one could see nearly 3,000 stars and those people in the darker regions can see nearly 10,000 stars. Many times as kids we would have counted these stars and the count will never seem to end. How many stars are there in the sky? What could have created the sky? How did the star formed? Astronomy is the most interesting subject which deals with all the celestial objects. Astronomers and scientist are in a deep search and do research on the various planetary objects. These glowing objects are not only stars but they also include comets, meteorites, asteroids and many other things. They all form the galaxies. Galaxy was considered as the birth place of all creation. The dust and the gas together form the stars, which is a massive ball of plasma. Having been created in the Nebula, the stars under goes various stages. Main sequence stars is the stage which the stars spends 90% of its life time. The sun is the nearest star to the earth is 4.6 billion years old undergo this stage for 10 billion years. Being in this busy world have we ever noticed or cared to read about all these scientific facts? Everything happens up in the sky!